<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title>时钟测试</title>
		<script type="text/javascript">
			function startTime(){
				var today = new Date();
				var h = today.getHours();
				var m = today.getMinutes();
				var s = today.getSeconds();
				m = checkTime(m);
				s = checkTime(s);
				document.getElementById('txt').innerHTML=h+":"+m+":"+s;
				t=setTimeout(function(){startTime()},500);
			}
			function checkTime(i){
				if (i<10){
					i = "0" + i;
					
				}
				return i;
			}
		</script>
	</head>
	<body onload="startTime()">
		<div id="txt"></div>
	</body>
</html>
